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/* $OpenBSD: encrypt.c,v 1.21 2004/07/13 21:09:48 millert Exp $ */
/*
* Copyright (c) 1996, Jason Downs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <login_cap.h>
/*
* Very simple little program, for encrypting passwords from the command
* line. Useful for scripts and such.
*/
#define DO_MAKEKEY 0
#define DO_DES 1
#define DO_MD5 2
#define DO_BLF 3
extern char *__progname;
char buffer[_PASSWORD_LEN];
void usage(void);
char *trim(char *);
void print_passwd(char *, int, void *);
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-k] [-b rounds] [-c class] [-m] [-s salt] [-p | string]\n",
__progname);
exit(1);
}
char *
trim(char *line)
{
char *ptr;
for (ptr = &line[strlen(line)-1]; ptr > line; ptr--) {
if (!isspace(*ptr))
break;
}
ptr[1] = '\0';
for (ptr = line; *ptr && isspace(*ptr); ptr++)
;
return(ptr);
}
void
print_passwd(char *string, int operation, void *extra)
{
char msalt[3], *salt;
login_cap_t *lc;
int pwd_gensalt(char *, int, login_cap_t *, char);
void to64(char *, int32_t, int n);
switch(operation) {
case DO_MAKEKEY:
/*
* makekey mode: parse string into separate DES key and salt.
*/
if (strlen(string) != 10) {
/* To be compatible... */
errx(1, "%s", strerror(EFTYPE));
}
strlcpy(msalt, &string[8], sizeof msalt);
salt = msalt;
break;
case DO_MD5:
strlcpy(buffer, "$1$", sizeof buffer);
to64(&buffer[3], arc4random(), 4);
to64(&buffer[7], arc4random(), 4);
strlcpy(buffer + 11, "$", sizeof buffer - 11);
salt = buffer;
break;
case DO_BLF:
strlcpy(buffer, bcrypt_gensalt(*(int *)extra), _PASSWORD_LEN);
salt = buffer;
break;
case DO_DES:
salt = extra;
break;
default:
if ((lc = login_getclass(extra)) == NULL)
errx(1, "unable to get login class `%s'",
extra ? (char *)extra : "default");
if (!pwd_gensalt(buffer, _PASSWORD_LEN, lc, 'l'))
errx(1, "can't generate salt");
salt = buffer;
break;
}
(void)fputs(crypt(string, salt), stdout);
}
int
main(int argc, char **argv)
{
int opt;
int operation = -1;
int prompt = 0;
int rounds;
void *extra = NULL; /* Store salt or number of rounds */
if (strcmp(__progname, "makekey") == 0)
operation = DO_MAKEKEY;
while ((opt = getopt(argc, argv, "kmps:b:c:")) != -1) {
switch (opt) {
case 'k': /* Stdin/Stdout Unix crypt */
if (operation != -1 || prompt)
usage();
operation = DO_MAKEKEY;
break;
case 'm': /* MD5 password hash */
if (operation != -1)
usage();
operation = DO_MD5;
break;
case 'p':
if (operation == DO_MAKEKEY)
usage();
prompt = 1;
break;
case 's': /* Unix crypt (DES) */
if (operation != -1 || optarg[0] == '$')
usage();
operation = DO_DES;
extra = optarg;
break;
case 'b': /* Blowfish password hash */
if (operation != -1)
usage();
operation = DO_BLF;
rounds = atoi(optarg);
extra = &rounds;
break;
case 'c': /* user login class */
extra = optarg;
operation = -1;
break;
default:
usage();
}
}
if (((argc - optind) < 1) || operation == DO_MAKEKEY) {
char line[BUFSIZ], *string;
if (prompt) {
if ((string = getpass("Enter string: ")) == NULL)
err(1, "getpass");
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
} else {
/* Encrypt stdin to stdout. */
while (!feof(stdin) &&
(fgets(line, sizeof(line), stdin) != NULL)) {
/* Kill the whitesapce. */
string = trim(line);
if (*string == '\0')
continue;
print_passwd(string, operation, extra);
if (operation == DO_MAKEKEY) {
fflush(stdout);
break;
}
(void)fputc('\n', stdout);
}
}
} else {
char *string;
/* can't combine -p with a supplied string */
if (prompt)
usage();
/* Perhaps it isn't worth worrying about, but... */
if ((string = strdup(argv[optind])) == NULL)
err(1, NULL);
/* Wipe the argument. */
memset(argv[optind], 0, strlen(argv[optind]));
print_passwd(string, operation, extra);
(void)fputc('\n', stdout);
/* Wipe our copy, before we free it. */
memset(string, 0, strlen(string));
free(string);
}
exit(0);
}
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